The receptive fields of complex cells in the early visual cortex are economically modeled by combining outputs of a quadrature pair of linear filters. For actual complex cells, such a minimal model may be insufficient because many more simple cells are thought to make up a complex cell receptive field. To examine the minimalist model physiologically, we analyzed spatial relationships between th...

The response properties and receptive field organization of 106 LSA neurons were investigated in pretrigeminal preparations using moving dark and bright stimuli with particular reference to the dynamic and static structure of receptive fields. About 61percent neurons revealed equal sensitivity to the motions of dark and bright stimuli. A majority of them had an ON-OFF static structure of recept...

The cerebral cortex has long been known to play a central role in the storage and retrieval of long-term memories. Therefore it would be expected that mechanisms of cortical plasticity underlying information storage should be found in the cortex of adult animals, and they should be manifest as an alteration in the functional specificity of cells, in the functional architecture of cortex, and in...

Receptive fields in primary visual cortex have been shown to be capable of rapid expansion and contraction when exposed to an artificial scotoma, a masked segment of the visual field. To distinguish cortical from thalamic contributions to receptive field mutability, we tested interocular transfer of the effect in binocular cortical receptive fields, presenting the conditioning stimulus to the f...

Visual receptive fields of superior colliculus neurons were investigated. The latencies of "on" and "off" responses were measured and their distribution all over the field was mapped. In 36 percent of the receptive fields the latency of the "off" response was shorter than the latency of the "on" response; 19 percent of the receptive fields had almost equal latencies; in 13 percent the latency o...

Detailed measurement of ganglion cell receptive fields often reveals significant deviations from a smooth, Gaussian profile. We studied the effect of these irregularities on the representation of fine spatial information in the retina. We recorded from nearby clusters of ganglion cells, testing their ability to determine the location of small flashed spots, and we compared the results to the pr...